Method and means of applying edge-covering strips to plaster board



June 17, w30.A J. scHUMAcHER METHOD AND MEANS OF APPLYING EDGE COVERING STRIPS TO PLASTER BOARD Filed Feb. 23, 1926 2 Sheets-Sheet 1 June 17, 1930. I J, scHUMAcHER 1,764,123

METHOD AND MEANS OF APPLYING EDGE COVERING STRIPS TO`PLASTER BOARD Filed Feb. 25, 1926 2 Sheets-Sheet 2 M I IlilllllllllllllllllllllIlll[IllllllllllllllllllllllllIllllIIIIlllllllllllllllllllllll Patented `une 1.7, 1930 UNITED STATES PATENT OFFICE JOHN SCHUMACHER, OF LOS ANGELES, CALIFORNIA METHOD AND MEANS F APPLYING EDGE-COVERNG STRIPS TO PLASTER BOARD Application led February 23, 1926.

This invention relates to a method and means for applying edge covering strips to plaster board.

In the manufacture of plaster board, it is a common practice to supply moist, unset plastic or cementitious material between two advancing sheets of iibrous material with the result that there is produced a board, the top and bottom of which is covered by fibrous 1o covering sheets but the side edges of the board are left open, exposing the plastic or cementitious material. processes have been devised for causing the fibrous covering material which covers the top and bottom of the board, to extend over and enclose the edges of the boards. These processes are so complex that they have not found any substantial commercial use.

It is the object of the present invention to provide a method and means by which strips of fibrous material of substantially the width of the edges of the plaster board may be passed to the plaster board at'the time it is formed in order to adhere to and cover the edges of the nished plaster board.

Another object of the present invention is to provide a means by which the edges of the plaster board may be simultaneously knurled or otherwise roughened and covered with a strip of fibrous material. A further object of the present invention is to provide a method and apparatus by which this finishing and covering of the edges of the plas ter board may be carried out continuously as the plaster board is formed.

and by which the preferred method of cover-V ing the plaster board edges may be practiced.

In the drawings: y Figure 1 is an elevationpartially in vertf cal section of the apparatus,

Fi ure 2 is a plan view of the apparatus,v

certain parts being removed,

Various means and` Serial No. 89,998.

Figure 3 is an enlarged elevation of edge strip applying means,

Figure 4 is a side view of the finishedy board,

Figure 5 is an elevation in section of a modiiied form of edge strip applying means showing a board produced thereby,

' Figure 6 is an elevation at right angles to Figure 5. c

Figure 7 is a side view of a board with the edge covering strip, and,

Figure 8 is a side elevation of the roller for forming the same. Y Y

Referring to the drawings, the apparatus there illustrated comprises a hopper 2 for holding and supplying plastic or -cementitious materialwhich isto be incorporated in the plaster board. 3 indicates a mixer for mixing the plastic or cementitious material with water supplied from a pipe 4. The mixer preferably comprises a vtrough in which are rotatably mounted mixing blades 5, the blades being mounted upon a shaft 6 driven by a pulley 7 8 and 9 respectivelyv indicate supply rolls of fibrous covering material which furnish the top and bottom covering sheet for the plaster board to be produced. 10 indicates a sheet or strip .of fibrous material supplied from the roll 8V for forming the lower covering sheet of the produced plasterboard whereas 11 indicates a sheet or strip supplied from the roll 9 as the upper sheet of the plaster board to be formed. The sheets 10 and 11 areindicated as passing from the rolls 8 and 9 to a plaster board forming and spreading means generally indicated at 12. Suitable advancing means 13 are provided for continuously con7 veying the plaster board being formed to the discharge end of the apparatus, such ad- 9 vancing means being indicated as comprising aconveyor 16.

The spreading and forming means 12 of the apparatus include an upper roller 20 andV a lower roller 21 spaced apart to determine the thicknessof the finished board. As the sheets 10 and 11 are fed' between the Y, rollers 20 and 21,` plastic or cementitious material is fed from the hopper onto a box 17 likewise positioned on` the advancing Y means 13 from which the plastic or cementitious material is spread by the rollers 2O and 21 between the sheets 10 and 11 and formed into a proper thickness of plaster c board. In so far as the apparatus and :methode oi' forming plaster board has been particularly described, it is similarto 4the generallyl accepted- Vapparatus Vand lmethod particularly described and claimed in Patent i and forming means.

No. 1,176,322, grantedr to John Schumacher`V anddoseph E. Schumacher, March 21, 1916.

In accordance With the present invention, meansare provided to :feed the fibrous vcovering material strips 10A and 411-to the spreading and` forming meansso that the strips Will be substantially .equal in length to Ythe' Width of the rolls 2G'an'd'21 of the spreading This, of course, may be accomplished by the use of rolls- 8 and 9 of fibrous covering' material substantially corresponding in Width With that of-the Vrolls 2O and21. In order t0 insure the sheets v kas suppliedv to the 'spreading and forming means 12 Will be of the proper thickness to correspond With the Width of such insane, it is generally preferable to provide aptrirn-y vI ningmeans orthe sheets positioned lin ad- Vance ofthe rolls 2O and 21. 22 and 23,

respectively, 'Y generally indi/cate trimming means for the respective sheets 10v and 11.

' This trimming means ,may be of any desired Y or preferred form,such as disk knives 24; and` v respectively, 'and `maypbe driven'in anyv desired manner.

here mention is madef'of the provision of the Afeeding or trimming of sheets 10 Vand 11 to correspond with the Width of the -rolls 20 *and 21 ofthe 'spreading and yorming means, it -is understood' that the sheets 10 andll-are'made'to beQequal tothe length of the rolls `20 and 21 as they"pass-therebe y tween. Inasxnuch as the Contact betweenV the fibrous 'coveringma'terial andthe moist-plas-V y ticV or cementitious Amaterial supplied froml box 17 causes inro'perationa slightswellingV y of'sheets-.lO andlll amounting to a fraction of an'inc'hpthe'trimmmg 'of the sheets byr the devioe22 and` 23 should be governed ac- Q i cordingly. J'Ihis makes thesheets 10 and 11 as cut .by thertrimming means, slightly Vnar-V f vrower thanthe `Width of the rolls20 and 21.

In accordance'wvith the present invention,

' a Vmethodand means isprovided torV continuallysmo'othi'ng Vthe edges of the plaster (boardl as the board ifs' formed' inorder that a; smooth clean'iedgewvill, be obtained; VFor this purpose, the invention preferably in-v cludes the .trowels described and 'claimed in l myvcopendin'g application Serial No. 11,169,

Viled February 24, 1925, Patent No.` 1,581,328,A Y issued April 220, v1926.V Y Suchtrowels are generally formed by yproviding disk la'ng gesv 26 on the endsy of one ofi 'the rolls120; and 21 flushiagainst the otherl roller so that'the movement of-such anges down "andacross vtherolls; f 35 and 36 respectively indicate rollsV ofV the plaster board as it is formed Will smooth the edges yand turn in the corners of the iibrous covering material, i y K lThe plaster board 27 indicated Vas contin uously passing as formed from the forming and spreading means 12 is passed AWhile still in an incompletely set condition between a pair of opposed knurledV rollers .28 yand 29 Which are mounted to revolve in the same plane as the plane oi? the traveling plaster r board and'having their facing edges engage ingl the edges of the .plaster board. The y edges of Vtherollms28, and 29 are slightiyV knurleol in orderitolproduce a slight roughen-` ing or knurling ot the edges ci the produced plaster board, `'and coacting .with veach ofthe- Y rollers 28 and29 arer'olls'() andl. i Thei rolls'28 and 29 also preferably farejpijovided`V With ldisk iianges 32` and forV extending over the top ot the plaster' board passing narrow fibrous covering material Which is` supplied 'continuousiyfrom the Vrolls .tothe 1 rolls 28, 30 and 29, 31, respectiveiy,r and thereby conveyed into positionV against: the. side edges fof the produced plasterboard 27 yBythis process andmeans, said strips are,

caused to adhere tothe incompletely set plasitic material cil theboard and properlygcover the normally. eiqoosed'edgesV of such plasterY board. yIt desired, thesestrips may include materialfor hardening theV edges of the 'plas-y ter board or material forassisting the strips 1nV adhermg'to the .plaster board or be 1mpre'gnated or caused to carryrother .ingredivents for like `or similar purposes. r Referring to Figures-5 and 6, itso'metimes is'desirable to form a vlongitudinal groovein the side of the plaster board and themethod and apparatus of the present invention provides ameansl bywhich this longimdmalV Y in the plaster board. s.

For., thisA f tion herein-described is Well adapted for *aci be made. Without departingifrom, the jprincplesof theinventionzandgtheiinventionine Y Y Y cludes all such modificationsandchangesas Vcome Within the ls'copreVV the complishing the objectsfo'the invention, it'.y

' 1s understood Vthat variousmodiiicat'ions :may

iso

1. In a process of producing plaster board, the steps of Vsmoothing the ed es of plaster board as the same is formed y the incorporation of plastic or eementitious material between fibrous covering sheets and then knurling said edges and supplying thereto thin sheets of fibrous covering material to cover the edges of said produced board.

2. A method of forming plaster board which includes Continuously passing strips of fibrous covering material between spreading and forming rolls, continuously supplying plastic or cementitious material between the sheets at the rolls7 continuously smoothing the edges of the board as formed to form a plaster board with smooth edges, continuously knurling and supplying to the edges of the board strips of fibrous covering material to cover the plastic or cementi'tious material at the edges of the plaster board.

3. An apparatus for forming plaster board comprising plaster board forming means, means for smoothing the edges of the board as formed, means for advancing the plaster board in said forming means, knurled edged rollers disposed at opposite sides of said latter means for engaging the formed plaster board, and means for supplying edge covering strips to saidl rollers.

Signed at Los Angeles, California, this 13 day of February 1926. Y

J OHN SCHUMACHER. 

